Skull theory - boy or girl?

[Faie33]

Posting for my best friend (mother of 3 boys and expecting again): 19w4d ultrasound of current pregnancy (top photo). Baby was being stubborn and kept its legs crossed! The bottom two pics are confirmed boys from previous pregnancies (older brothers). Any educated guesses of what this baby could be?? Thanks!

[Faie33]

Updated photo comparison. Top left: Big Brother #1 :bigboy: , top right: Big Brother #2 :bigboy: , Bottom left: Big Brother #3 :bigboy: , and bottom right: gender unknown ??
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[Jessiikahh]

from skull theory i would say girl, good luck :)

[Faie33]

Update:. Confirmed by 3D ultrasound. Baby #4 is a boy!

[Claire33]

Congrats to your friend!